
/*
** Lua Parser
** See Copyright Notice in lua.h
*/

#ifndef lparser_h
#define lparser_h

#include "llimits.h"
#include "lobject.h"
#include "ltable.h"
#include "lzio.h"

/*
** Expression descriptor
*/

typedef enum {
  VVOID,                               /* no value */
  VNIL,
  VTRUE,
  VFALSE,
  VK,                                  /* info = index of constant in `k' */
  VLOCAL,                              /* info = local register */
  VUPVAL,                              /* info = index of upvalue in `upvalues' */
  VGLOBAL,                             /* info = index of table; aux = index of global name in `k' */
  VINDEXED,                            /* info = table register; aux = index register (or `k') */
  VJMP,                                /* info = instruction pc */
  VRELOCABLE,                          /* info = instruction pc */
  VNONRELOC,                           /* info = result register */
  VCALL                                /* info = result register */
} expkind;

typedef struct expdesc {
  expkind k;
  int info, aux;
  int t;                               /* patch list of `exit when true' */
  int f;                               /* patch list of `exit when false' */
} expdesc;

struct BlockCnt;                       /* defined in lparser.c */

/* state needed to generate code for a given function */
typedef struct FuncState {
  Proto *f;                            /* current function header */
  Table *h;                            /* table to find (and reuse) elements in `k' */
  struct FuncState *prev;              /* enclosing function */
  struct LexState *ls;                 /* lexical state */
  struct lua_State *L;                 /* copy of the Lua state */
  struct BlockCnt *bl;                 /* chain of current blocks */
  int pc;                              /* next position to code (equivalent to `ncode') */
  int lasttarget;                      /* `pc' of last `jump target' */
  int jpc;                             /* list of pending jumps to `pc' */
  int freereg;                         /* first free register */
  int nk;                              /* number of elements in `k' */
  int np;                              /* number of elements in `p' */
  int nlocvars;                        /* number of elements in `locvars' */
  int nactvar;                         /* number of active local variables */
  expdesc upvalues[MAXUPVALUES];       /* upvalues */
  int actvar[MAXVARS];                 /* declared-variable stack */
} FuncState;

Proto *luaY_parser(lua_State * L, ZIO * z, Mbuffer * buff);

#endif

/*
 * Local Variables:
 * c-basic-offset: 2
 * indent-tabs-mode: nil
 * End:
 */
